Brake-shoe.



,908. y k Patented Oct. 6, 1908.

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' 0; s. SHALLENBERGER.

BRAKE SHOE.

C. S. SHALLENBERGER. b

. BRAKE SHOE. APPLIGATIoN HLBD JU'NE 5,1908.

` 900,600. Patentea'oct. 6,1908.

3 SHBETS-SHEET 3..

Wm-NEEEEE TUR 35.0. W

CHARLES S. SHALLENBERGER, OF ST. LOUIS, MISSOURI.

BRAKE-SHOE.

HVT 0 all whom 'it may concern:

Be it known that I, CHARLES S. SHALLEN- BERGER, a citizen of the UnitedStates, residing at St. Louis, county of St. Louis City, and State ofMissouri, have invented certain new and useful I mprovements in Brake-Shoes, of which the following is a specification.

The invention relates to such improvements and consists of the novelconstruction and combination of parts hereinafter described andsubsequently claimed.

Reference may be had to the accompanying drawings, and the referencecharacters marked thereon, 'which form a part of this specification.Similar characters refer to similar parts in the several figurestherein.

This invention relates to that class of brake-shoes Wherein metal platesdiffering in density from the cast-metal body of the shoe have beenembedded in the casting forming such body for the purpose of providingmetal surfaces of differingv density ada ted to engage a wheel surface.

The object of the inventionis to'provide brake-shoes with aninsert-plate of any desired density which will prolong the life Vof theshoe and increase its wearing limit without changing in any degree theproportion of hard and softsurfaces in using the shoe.

The invention consists in'providing an insert-plate of the curvaturedesired with one or more offsets or projections on the face and back ofthe plate, so spaced that an offset on one side of the `plate will belocated opposite the groove or space between neighboring offsets on theopposite side of the plate, all of the offsets beingof approximately thesame thickness.

The ofisets are also so formed and disposed relatively to each otherthat the face and back surfaces of all the offsets are parallel with andequidistant from each other, and the back-surface of a face-offsetwould, if extended, intersect the face-surface of a back-offset, as Willbehereinafter described and subsequently pointed'out in the claims.

Referring to the drawings: Figure 1 is a plan view of the face of thecompleted brakeshoe. Fig. 2 is a longitudinal, vertical vsection takenon the broken line 2-2 in Fig. 1. Fig. 3 is a view in isometricalperspective of the insert-plate detached. Fig. 4 is a view inisometrlcal' perspective, showing a modified form of insert-platedetached. Fig.V 5 is a plan view of the face of a completed brake-Specification of Letters Patent.

Application filed .Tune 5, 1908.

Patented Oct. 6, 1908.

Serial No. 436,777.

shoe provided with the insert-plate shown in Fig. 4. Fig. ,6 is alongitudinal, vertical section taken on the broken line 6-6 in Fig. 5.Fig. 7 is a view in isometrical perspective, showing another modifiedform of insertplate. Fig. 8 is Aa plan view of the face of a completedbrake-shoe provided with the insert-plate shown in Fig. 7. Fig. 9 is alongitudinal, vertical section taken on the broken line 9-9 in Fig. S.Fig. 10 is a plan view of the face of a completed brake-shoe, with oneend part broken away, showing a modified arrangement of Strengtheningribs. Fig. 11 is an isometrical perspective, showing an insert-platecomposed of a single faceoffset and a singleiback-ofliset provided withconnecting Strengthening ribs.

The cast-metal body, 1, is cast about the insert-plate, 2, in the usualwell known manner, so that the metal enters the grooves, 3, in the backof the plate, and the grooves, 4, in the face of the plate, and inclosesthe Whole of the insert-plate except the surface of the face-ofisets, 5,which are located contiguous to the face-grooves, 4, as will be seenfrom inspection of Figs. 1 and 2.

The face of the completed shoe will thereof offsets, 5, and theoomparatively soft surface of the cast-metal body, 1, which entirelysurrounds the harder surfaces, as will be seen in Fig. 1.

VVhen the brake-shoe is so worn that the insert-plate is reduced toone-half its original thickness, it will be apparent from an inspectionof Fig. 2 that the comparatively soft casting which iills the grooves inthe back of the insert-platev will be brought to the facesurface of theshoe, and the face-offsets, 5, of the insert-plate will be wholly wornaway.

While the remaining half of the insertplate, consisting of theback-offsets, 6, is being worn away, the same proportion ofhard and softsurfaces will be maintained that prevailed during the wearing away ofthe first half of the insert-Plate, consisting of offsets 5.

The softer, cast-metal in the grooves of the back will be brought to theface-surface of Vthe shoe, and occupy positions severally opporemain thesame until the insert-plate is Wholly worn away.

It is not desired to limit the invention to the use of a plurality ofoffsets, either 011 the face or back of the plate, and in Fig. 4 isshown a form of insert-plate having one ofi`- set-projection, 10, on theface of the plate, and two ofi'set-projections, 12, on the back of theplate.

When the insert-plate is provided with a series or plurality of offsets,the plate may be strengthened by connecting the neighboring offsets bymeans of a narrow flange, as shown in Figs. 7, 8 and 9, wherein theseveral faceofl'sets are shown connected by a Strengthening rib, 20, andthe back-offsets by a strengthening rib, 21. These Strengthening ribsare shown in Figs. 7, S and 9, located in the longitudinal middle partof the plate, but it is obvious that such ribs may be located at theside edges of such plate, as shown in Fig. 10. In this figure I haveshown two ribs, 22 and 23, connecting the neighboring offsets at theside edges of the plate, thus forming pockets, 24, instead of opengrooves between the neighboring offsets.

Each end-offset of the insert-plate is connected with its neie'hboringoffset by a rib projecting from one side, preferably a distance equal tothe thickness of the offsets, so that such rib forms a narrow projectionof the neighboring offset, as shown by the ribs, 30, in Fig. 7, andribs, 31, in Fig. 11.

i/Vhen the insert-plate comprises only two ofl'sets, one a face-offsetand the other a backoffset, as shown in Fig. 11, two or more suchinsert-plates may be employed, and so arranged as to distribute thewearing surfaces equally on the opposite end-portions of the brake-sh0e, approximately at equal. distances from the middle transverse lineof the brake-shoe.

VVhat I claim as new and desire to secure by Letters Patent is- 1. Aninsert-plate for brake-shoes comprising face and back-offsets, so formedand disposed relatively to each other that the face and back-surfaces ofsuch offsets are parallel with and equidistant from each other, and theback-surface of a face-offset would if extended intersect theface-surface of a back-offset.

2. An insert-plate for brake-shoes having a series of offsets along theface and back of such plate, the offsets in the back of the platealternating with the offsets in the face of the plate.

3. An insert-plate, for brake-shoes having in its face a series oftransverse grooves, and in its back a series of corresponding trans-Verse grooves, the grooves in. the face being located opposite theSpaces between the grooves in the back respectively.

4. An insert-plate for brake-shws having a series of groovos in the'face and 'hack of such plate, the grooves in the back of the platealternating with the `g'rooves in the face of the plate, all the groovesbeing approximately of the same depth, and of a depth equal to one-halfthe thickness of the insert-plate.

5. In a ln'ake-shoe, the combination with an insert-plate having aseries of olfsei's in the face and back of such plat e, the ol'fsets inthe back of the plate alternating with the offsets in the face of theplate; of a castinetal body wholly inclosing the insert-plate except theface surfaces of the face-offsets.

6. In a brake-shoe, the combination with an insert-plate having a seriesof grooves in the face and back of such plate, the `grooves in the backof the plate alternating` with the grooves in the face of the plate, allthe greoves being approxinlately of the same depth, and of a depth equalto one-half the thickness of the insert-plate; of a. cast-niet al bodyfilling such groovcs, and inclosing the whole of such plate except theface-surfaces contiguous to the grooves.

7. Jin insert-plate for ln'ake-shoes lntvingI on one of its sides aseries of alternating offsets and grooves, the neighlioring` oli'setsbeing connected by a strengthening rih.

S. An insert-plate 'for brake-shoes comprising face and hack-offsets, soformed and disposed relatively to each otl er that the face andback-surfaees of such olfsets are parallel with and equidistant fromeach other, and the lnu-.k-surfm'e of a :lime-offset would if extendedintersect the `face-surfaee of a back-offset, such offset being providedWith Strengthening ribs, each rib connecting a face-offset with aback-offset.

In testimony whereo'f, I have herennto set my hand this 23rd day of May,1008.

CHARLES S. SlllllhllNllllliGl'lll.

I'Vitnesses:

L; DAvmsoN, O'r'ro II. Gnnzs.

